<?php

namespace App\Http\Controllers\Public;

use App\Http\Controllers\Controller;
use App\Models\ProgramQrCode;
use App\Services\AttendanceService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class CheckinController extends Controller
{
    public function __construct(private AttendanceService $attendanceService) {}

    public function show(string $qr_token): View|RedirectResponse
    {
        $qrCode = ProgramQrCode::where('token', $qr_token)->where('is_active', true)->firstOrFail();
        $program = $qrCode->program;

        if ($program->status !== 'published') {
            return view('public.checkin.unavailable', compact('program', 'qrCode'))
                ->with('message', 'Program ini belum dibuka atau sudah ditutup.');
        }

        // If download period is active → redirect to attendance check page
        if ($program->isDownloadOpen()) {
            return redirect()->route('public.semak.show', $qr_token);
        }

        // Check-in not yet open
        if ($program->checkin_start_at && now()->lt($program->checkin_start_at)) {
            return view('public.checkin.unavailable', compact('program', 'qrCode'))
                ->with('message', 'Check-in belum dibuka. Mula pada ' . $program->checkin_start_at->format('d M Y, H:i'));
        }

        // Check-in already closed
        if ($program->checkin_end_at && now()->gt($program->checkin_end_at)) {
            return view('public.checkin.unavailable', compact('program', 'qrCode'))
                ->with('message', 'Tempoh check-in telah tamat.');
        }

        return view('public.checkin.show', compact('program', 'qrCode'));
    }

    public function staffCheckin(string $qr_token, Request $request): View|RedirectResponse
    {
        $qrCode  = ProgramQrCode::where('token', $qr_token)->where('is_active', true)->firstOrFail();
        $program = $qrCode->program;

        $request->validate([
            'no_kp' => ['required', 'string', 'max:20'],
        ], [
            'no_kp.required' => 'Sila masukkan No. Kad Pengenalan anda.',
        ]);

        $result = $this->attendanceService->staffCheckin($program, $request->no_kp, $request);

        return match ($result['status']) {
            'success'           => view('public.checkin.success', [
                                        'program'     => $program,
                                        'participant' => $result['participant'],
                                        'attendance'  => $result['attendance'],
                                        'qrCode'      => $qrCode,
                                    ]),
            'already_checked_in' => view('public.checkin.already', [
                                        'program'     => $program,
                                        'participant' => $result['participant'],
                                        'attendance'  => $result['attendance'],
                                    ]),
            'not_found'          => back()->withInput()
                                          ->with('error', 'No. Kad Pengenalan tidak dijumpai dalam senarai peserta program ini.')
                                          ->with('show_external_option', $program->allow_walk_in),
            'not_registered'     => back()->withInput()
                                          ->with('error', 'No. Kad Pengenalan tidak dijumpai dalam senarai pra-daftar.')
                                          ->with('show_external_option', $program->allow_walk_in),
            default              => back()->with('error', 'Ralat tidak dijangka. Sila cuba lagi.'),
        };
    }

    public function externalRegister(string $qr_token, Request $request): View|RedirectResponse
    {
        $qrCode  = ProgramQrCode::where('token', $qr_token)->where('is_active', true)->firstOrFail();
        $program = $qrCode->program;

        if (! $program->allow_walk_in) {
            return back()->with('error', 'Pendaftaran orang luar tidak dibenarkan untuk program ini.');
        }

        $request->validate([
            'name'   => ['required', 'string', 'max:255'],
            'no_kp'  => ['required', 'digits:12'],
            'email'  => ['nullable', 'email', 'max:255'],
            'phone'  => ['nullable', 'string', 'max:20'],
            'agency' => ['nullable', 'string', 'max:255'],
        ], [
            'name.required'  => 'Sila masukkan nama penuh anda.',
            'no_kp.required' => 'Sila masukkan No. Kad Pengenalan anda.',
            'no_kp.digits'   => 'No. Kad Pengenalan mestilah 12 digit tanpa sempang.',
            'email.email'    => 'Format emel tidak sah.',
        ]);

        $result = $this->attendanceService->walkInRegister($program, $request->all(), $request);

        return match ($result['status']) {
            'success'            => view('public.checkin.success', [
                                        'program'     => $program,
                                        'participant' => $result['participant'],
                                        'attendance'  => $result['attendance'],
                                        'qrCode'      => $qrCode,
                                    ]),
            'already_checked_in' => view('public.checkin.already', [
                                        'program'     => $program,
                                        'participant' => $result['participant'],
                                        'attendance'  => $result['attendance'],
                                    ]),
            default              => back()->withInput()->with('error', 'Ralat sistem. Sila cuba lagi.'),
        };
    }
}